Analysis of cascaded sections of T junctions between rectangular and circular waveguides

An analysis of the cascaded sections of a number of slot-coupled T junctions between rectangular and circular waveguides is presented, taking into account the mutual interactions of all possible modes generated by the discontinuities as well as the effect of wall thickness. The formulation is based on solving a set of coupled integral equations resulting from the boundary conditions at the two interfaces of the waveguide sections representing the coupling slots. The integral equations are transformed into sets of matrix equations using the moment method with entire basis and testing functions. Numerical results on input VSWR (voltage standing wave ratio) and coupling are presented for the case of a cascaded section of two air-filled T junctions for different frequencies and different values of interelement spacing.<
>